Heating element for electric stoves



HEATING ELEMENT FOR ELECTRIC STOVES Filed Nov. 18, 1926 2 Sheets-Sheet l March 25, 1930. c. M. DIBBLE HEATING ELEMENT FOR ELECTRIC STOVES Filed Nov. 18, 1926 2 Sheets-Sheet 2 I embodying my invention;

Patented Mar. '25, 1930 CLAUDE H. DIBBLE, OI 'QIOLIET, ILLINOIS, ASSIGNOR TO MOORE BROTHERS COMPANY,

OF JOLIET, ILLINOIS, A CORPORATION OF ILLINOIS HEATING ELEMENT FOR ELECTRIC STOVES Application filed ltovember 1a, 1926. Serial No. 149.086.

This invention relates to a heating unit for electrical heating devices such as stoves, and the like, and to a bushing for supporting the heating element or heating coil in heating units.

' An important object of the invention is to provide a heating unit that may be easily assembled, that will hold the heating element or coil substantially rigid and that will permit of free and unlimited expansion of the insulating bushings.

Another important object of the invention is to provide a heating unit in which broken or fractured bearing devices may be replaced Without removing or disturbing other hearing members of the heating unit and Without re-threadingthe heating element.

Another important object of the invention is to provide a simple bushing that is formed of two or more parts that may be assembled over the coil and locked to the frame or supporting member so that the heating unit may be more quickly assembled or to eliminate the-operation of threading the heating element through a number of bushings when assembling the heating unit and to permit of replacing any one or more of the bushings upon occasion Without disturbing other bushings in the heating unit.

Another important object of the invention is to provide a two-part bushing the parts of which are substantially exact duplicates and the ends of which are formed to interlock so that the two parts will be correctly aligned when assembled and such a device that is adapted to embrace the opposite side of 'a wall member or provided with a peripheral or surrounding groove for limiting axial movement of the bushing when assembled.

Numerous other objects and advantages of the invention will be apparent as it is better understood from the following description, which, taken in connection with the accompanying drawings, discloses a preferred ,embodiment thereof.

Referring to the drawings:

Fig. 1 is a plan-view of a heating unit Fig. 2 is a section taken substantially on line 2-2 in Fig. 1;

Fig. 3 is a section line 3-3 in Fig. 2;

Fig. 4 is an enlarged section taken substantlally on line 4-4 in Fig. 2;

Fig. 5 is a perspective view of a preferred form of clamping strip;

Fig. 6 is a perspective view of a preferred form of wall member; and

Fig. 7 is a perspective view of one of the bushing parts.

T 0 illustrate my invention I have shown a heating unit of a type that is particularly adapted for use in a cooking stove. It will be understood, however, that the heating unit is capable of use in other similar devices.

The heating unit shown (Fig. 1) includes a frame 11, a supporting member 12, a heating coil or element 13, a plug device 14-, a plurality of supporting ribs or walls 15, and a plurality of bushings 16 arranged to support the heating element at a plurality of points and on the walls 15. The frame 11 maybe of any suitable form and is constructed in accordance with the desired use of the heating unit. The supporting member 12 is preferably of sheet metal and substantially rectangular having flanges 17 extending about the edges thereof any two or more of which may be secured to the frame 11 by means of spot-welding, riveting, bolts, or the like, to provide a unit structure. The'heating element in the present instance is of the coiled resistance wire type and may be formed of one continuous coil or two or more separate coils-connected electrically to the plug member 14 which may be any suitable device for making contact with a power circuit or source of electrical energy.

The walls 15 are preferably formed of strips of sheet metal having a wall part 21 that may extend vertical or perpendicular to the supporting member 12 and preferably a base part 22 that may be secured to the supporting member 12 by spot-welding as indicated at 23 (Fig. 4) or connected in any suitable manner. The strips are also secured rigidly to the supporting member by providing flanges 17 by bending extended ends of the strip at right angles to the strip and similarly securing them to the wall plates. The

taken substantially on bushin s 16 are preferably formed of two parts 0 identical shape or substantially identical shape and formed so that the two parts will Cooperate to surround or embrace the heating element at the various points of support. I have shown in Fi 7 a part of a preferred form of bushing. lwo like halves or semi-circular parts co-operate to form an an nular bushinghaving an opening 24 extending therethrou h and a groove 25 extending thereabout. Tlie ends 26 of each part are similarly, and oppositely formed so that the endsof the other half whichisipreferably an [exactduplicate willinterlock with the end "thereof to line up the two parts to provide the substantially round openlng 24. The wall part 21 of the Wall members 15 is provided with'a pluralitybf recesses or notches 27 preferably having a rounded ottoIn and suitably spaced apart to provide tongues 28 between the recesses. A locking strip 31 is provided for locking the bushings 16 in the recesses 27 that is preferably formed to provide a vertical wall part 32, having recesses 33 therein corresponding with the recesses 27.

and similarly formed and spaced to provide tongues 34 between the recesses. A flange 35 may be formed from the top of the wall 32 to re-enforce the wall against warping at its upper edge under the action of heat. The clampingstrip 31 may be locked to the wall plate 21 in any suitable manner and forms a part thereof when assembled thereto. The clamping strip 31 may be secured to the wall 21 by means of stove bolts 36 extending through apertures 37 in the clamping strip and apertures 38 in the wall member 21.

The frame 11 and supporting member 12 are secured together, the wall members 21 are then secured thGIGtQ and the contact member 14 is attached to the frame. The unit is then ready to receive the heating element or coil. One-half of a bearing member 16 is located in each notch 27 and the wire located in the half of the opening 24 formed by the art seated in the notch 27. After all of the ottom halves of the bearing members are assembled, or all of those that are seated on one wall are assembled and the heatin coil is located thereon the upper half 0 the bearing member is added, the clamping strip 31 is then applied and secured.

The groove 25 in the bearing membersis preferably of sufficient width to admit the tongues 28 and 34 when overlapped and when one of the parts is positioned in the wall 21 slightly to one side and the other is positioned over that part, the tongues 34 of the clamping strip 31 may be inserted in the grooves 25, the strip may then be pressed or lowered to the position shown (Fig. 2) and bolted or otherwise secured in place for limiting axial or other movement of the bushings 16 and locking them in operative position. If a bushing 16 should become damaged or prove defective so that it would require replacement after assembly or use of the heating unitit is only necessary to remove the bolts 36 or detach the clamping strip 31 on the wall in which the bushing is held and: remove'the bushing by slipping it about the heating coil and similarly replace a new bushing for the old. The clamping strip 31 may here-secured in operative position and no other bushings ,hereinbefore described being merelya pre- 'ferred embodiment thereof.

I claim:

1. An electric heating unit, comprising a heating element, heating element retaining members, and insulators passing through said heating element retaining members, said heating element retaining members being composed of substantially duplicated parts adapted to embrace said insulators from opposite sides and overlapping in said embrace to retain said insulators in place.

An electric heating unit, comprising a frame, a heating element, and means supporting the heating element at a plurality of points in the frame, said means including a pair of matched notched sheet metal cross members, and two-piece bushings insertable in matching notches of said cross members, parts of the bushings being substantial duplicates each of the other and said members also being substantial duplicates each of the other, said members overlapping when'arranged in retaining position.

CLAUDE M. DIBBLE.

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